Design tips for punched sheet metal parts drawings
What should we pay attention to when designing/drawing a sheet metal part to be produced with punching?
Punching operations:
- piercing
- perforating
- notching
- sinking
- nibbling
- lancing
- embossing
When designing a sheet metal product the first and foremost thing is to keep in mind the characteristics of the material to be processed.
Fundamentals:
- for forming only those dimensions should be given that are important and required
- the height of forming must not exceed 23mm from the bottom of the plate
- if possible, format only upwards from the bottom
Main types of forming:
Sinking
- can be done from both dimensions
- the bevel angel should be 60-120°
- it is a non-circular sinking and feasable
- it cannot be fully continuous
Embossing
- can be circular or a profle
- if it is a profile, a min. 3-4 x sheet thickness radius should be designed and the angles should be as small as possible (max. 45°)
- the height measured from sheet top to sheet top should not exceed the 3 x sheet thickness distance
- a distance of 12mm should be left between two embossings
Thread punching
- max. 2-2,5 x sheet thickness can be achieved
- a distance of 6x sheet thickness should be left between two thread punchings
- a distance of min. 3-4 x sheet thickness is recommended from the edge of the sheet
Marking
- can be letters, numbers, logos and symbols
- can be from below or above
Picture source: PASS STANZTECHNIK AG (http://www.pass-ag.com)